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Connect & Reconnect WordPress to Microsoft 365 Email
Step-by-step instructions for the client's Microsoft 365 administrator or IT support provider to configure, and later reconnect, WP Mail SMTP so WordPress can send email through the client's authorized Microsoft
MIGRATION DATE: 08/21/2026 (Friday) WINDOW START: 10:00 PM EST EST. DURATION: 3–5 hours MAIL LOSS RISK: None — incoming mail is captured
If your business uses Microsoft 365 for email, messages that appear to come from your company email address are expected to be
The error “550 Authentication is Required for Relay” occurs when an email client tries to send a message through the mail server
Why You Might Not Receive an Email in SmarterMail — Even If the Sender Has Emailed You Before It can be confusing
Why the Sending Mail Server Isn’t Responsible When Legitimate Email Isn’t Delivered It’s one of the most common support questions email providers
If your mailbox reaches 75% capacity, we recommend cleaning up your email to avoid send/receive interruptions. Managing Your Email Storage Each email